使用火碱进行场地消毒时，适宜的浓度是（）
A.2-4%
B.5-7%
C.8-10%
D.1%
参考答案：A
创办《新青年》杂志的是 [ ]
A．李大钊
B．陈独秀
C．鲁迅
D．胡适
The expert says ______ in performance can be applied successfully to a political career.
A．training B．trained C．to be trained D．being trained
